Sheet-metal pulley.



No. 653,28l. Patented July ID, I900. C. A. BRINLEY &. E. G. BUDD.

SHEET METAL PULLEY.

(Application filed Ian. 27, 1899.)

(No Model.)

T ncnms PETERS c0, PHOTO-LITHO., WASHINGTON u c.

NlTED STATES 'ATENT omen CHARLES A. BRINLEY AND EDWARD G. BUDD, OFPHILADELPHIA, PENN- SYLVANIA, ASSIGNORS TO THE AMERICAN PULLEY COMPANY,OF PENN- SYLVANIA.

SHEET-M ETAL PU LLEY.

SPECIFICATION forming part of Letters Patent No. 653,281, dated July 10,1901).

Application filed January 27, 1899. Serial No. 703,530. (No model.)

T0 to whom it may concern:

Be it known that we, CHARLES A. BRINLEY and EDWARD G. Bonn, of the cityand county of Philadelphia,in the State of Pennsylvania, have inventedan Improvement in the Mannfacture of Sheet-Metal Pulleys, of which thefollowing is a specification.

Our invention has reference to the manufacture of sheet-metal pulleys;and it consists of certain improvements, which are fully set forth inthe following specification and shown in the accompanying drawings,which form a part thereof.

Our improvements have special reference to the manner of reinforcing thespoke-arms adjacent to the hub portion, whereby great torsional effectsupon the hub shall not rupture or tear the metal at the juncture of thespoke-arms with said hub.

Our improvements relate more particularly to the character ofsheet-metal pulley set out in Letters Patent No. 595,559, dated December14, 1897, in which a sheet-metal rim is connected to a hub portion byradial sheetmetal spokes, terminating in the center in curved portionswhich make up the hub,there being substantially three radiating arms toeach semicircular curved portion constituting a semihub-section. Thesemihub-sections so formed are clamped together by suitable hub-clamps,as illustrated in the aforesaid patent.

Our present improvements are specially designed with reference tostrengthening the connection of the radial spoke-arms with the hubportions, and this we accomplish by employing semi-annularplate-sections fitted to the rear or inner faces of the spoke-arms andto which they are bolted or riveted. Furthermore, we prefer to formprojections or irregular portions upon these semi-annularreinforcing-pieces, which are adapted to fit into or upon the corrugatedportions of the radial arms adjacent to the hub portion, the result ofthis being that strains in the plane of revolution of the wheel aresustained by extended irregular surfaces in contact between the saidreinforcing semi-annular plates and the radial arms.

Our invention will be better understood by reference to the accompanyingdrawings, in which- I Figure l is a side elevation of a sheet-metalpulley with the hub-clamps indicated in dotted lines. Fig. 2 is avertical sectional elevation of the upper part of the same, and Fig. 3is a perspective view of one of the semi-annular reinforcing-plates.

A is the sheet-metal rim and is provided with the annular internalflange B, to which the spoke-arms O are riveted. The spokearms 0 of eachsection radiate from a semicircular curved hub portion D and may bereinforced by ribs or corrugations c, which preferably do not extendquite to the semicircular part D, so as to leave the portions 61 withthe single bend-namely, that between the parts D and c. gations in themanner herein set out the spoke-arms O and the semicircular'parts D arematerially strengthened over that resulting from the constructionheretofore employed, which was to extend the corrugations 0 down intothe body of the semicircular portion D. There are four sets or sectionsof radial spoke-arms and semicircular upper portions 0 D, two setsthereof being opposed to each other, as in Fig. 2, to correspond to onehalf of the split pulley and similarly the other two to constituteportions of the other half of the said split pulley.

From the nature of the construction, due to the special manufacture ofsheet-metal pulleys of the character here under consideration, the metalat the juncture between adjacent arms 0 O is relatively weak, and in theuse of pulleys where great torsional strain results in the operation ofthe machinery it is found necessary to reinforce the spokearms adjacentto the hubs, and this We accomplish by employing semi-annular plates E,which are fitted up against the inner faces of the spoke-arms adjacentto the hub. The semi-annular portions E are provided with projectingportions or corrugations G, which fit into the recesses formed by thecorrugations 0 in the spoke-arms, and the said plate E is secured to thespoke-arms by rivets or By arranging the corrubolts I, which passthrough apertures H. The rivets I hold the surfaces of the plate E andthe spoke-arms firmly in contact, as indicated in Fig. 2, and hence anystrain put upon the spoke-arms O is transmitted to the semi-annularplate E not only through the rivets I, but also through the irregularconnection secured by the fitting of the projections G into the recessesformed by the corrugations c in the spoke-arms. It is evident, however,that the projections G and the corrugations c of the spoke-arms may bedispensed with, if so desired, or either of them may be omitted; but inpractice we prefer to employ said projections and corrugations asillustrated. By the construction here shown it is evident that thespoke-arms are firmly connected and reinforced adjacent to the hub, sothat there is no danger of rupturing the metal at the juncture of thespoke-arms with the semicircular portions D.

J are semicylindrical hub portions which directly receive the shaft andare suitably secured to the semicircular flanges D by riveting. The twohalves of the pulley are secured together by rim-bolts F, which maintainthe half-rims of the pulley in perfect alinement. The pulley is clampedupon the shaft by means of the hub-clamps J, (indicated in dottedlines,) said hub-clamps drawing the two semicircular hub portions towardeach other and causing them to grip firmly .-of the rim portion with aseries of radial spoke-arms united at their inner ends inteigrally witha semicircular hub portion arupon the shaft.

We would also point out that while it is preferable to locate thesemi-annular plates E between the two sets of spoke-arms constitutingone-half of the pulley, as indicated in 'Fig. 2, it is quite evidentthat said plates might be arranged upon the outer faces of saidspoke-arms or upon both faces, if so desired.

The minor details of construction may be modified without departing fromthe principles of ourinvention. Hence While we prefer the constructionshown as excellently adapted in practice to accomplish the resultsdesired we do not limit ourselves thereto, since our improvementscomprehend, broadly, the employment of curved plates adjacent to theinner ends of the spokes and to which they are firmly secured, wherebythe strain upon one spoke is directly transmitted to the others.

Having now described our invention, what we claim as new, and desire tosecure by Letters Patent, is

1. In a sheet-metal pulley, the combination of radial spoke-arms formedintegral with a semicircular hub-piece and from which they radiate andseparated throughout their length beginning at the hub-piece, and asemi-annusemicircular hub-piece and from which they radiate andseparated throughout their length beginning at the hub-piece and furtherbeing provided with corrugations or ribs in the direction of theirlength, a semi-annular plate secured directly to each of the radial armsadjacent to the semicircular hub-piece and j having a series of raisedportions formed in 5 the face thereof adapted to the curvature or iirregularity of the corrugations in the spokearms, and rivets or boltspassing through the corrugations of each of the spoke-arms and 'g eachof the raised portions of the semi-annular plate for firmly securingthem together, whereby torsional strain between the shaft and rim of thewheel shall be distributed bei tween the several spoke-arms.

3. In a sheet-metal pulley, the combination ranged substantially atright anglesto said radial spoke-arms and in which the said spoke-armsare formed with ribs or corrugations 0 which terminate at a shortdistance from the semicircular hub portion so as to leave a small space61 between said corrugations and the semicircular hub portion wherebythe bend between said hub portions and the spoke-arms is not weakened bythe additional bends of the corrugations.

In testimony of which invention. we have hereunto set our hands.

CHARLES A. BRINLEY. EDWARD G. BUDD.

Witnesses:

FRANK G. Gnrnn, GEORGE N. MARONEY.

